Waiting for black friday to see if I can get a good deal. The wait's killing me!

Don't wait long... one thing about babies is that they are
never
that age again. Each day is the last chance you will ever have to photograph a baby at that age. Don't miss too many chances, because 20-30 years from now the idea that the pictures didn't happen because you wanted to save $100 will ring too hollow to believe!

I like the idea of the D90 with an 18-105mm kit lens, plus the SB-600 flash. The 50mm f/1.8 is so inexpensive it's worth tossing in the bag too; but you might want to look at an 85mm f/1.8 instead as the low light lens to buy next.

After that, think about an old two ring 80-200mm f/2.8 AFD zoom lens.

Whatever you decide on, go for it... before the baby is asking for keys to the car.